Manifold for mttlticylinbeb internal-combustion engines



Feb. 6, 1923.

A. P. BRUSH. MANIFOLD FOR MuLTIcYLI NDER INTERNAL CoMBusTloN ENGINES,

FILED JUNE 1 l 55.3 #www3/m d @Wou/Iman Patented Feb. 6, 1923..

nutren srares ALANSON P. BRUSH, OF DETROIT, MICHIGAN.

'MANIFOLD FOB, MULTICYLINDER INTERNAL-COMBUSTIO ENGINES.

Application led. June 11, 1920. Serial No. 388,188.

To all whomA it may cono/ew Be it known that I, Aminson l). BRUSH, a citizen of the United States of America, residing at Detroit, in the county of Wayne andState of Michigan, have invented certain new and useful Improvements in Manifolds for li/[ulticylinder Internal-Combustion Engines, .of which the following is specification, reference being had therein to the accompanying drawings.

The invention relates to a method for symmetrizing the explosive gases supplied to an internal combustion engine to insure uniformity of quantity and quality thereof, aftery leaving the carburetor or other vaporizing means, and to the means for carrying out this method, namely, manifolds for multi-cylinder internal combustion engines. One of its objects is the obtaining ofa manifold construction in which the eX- plosive mixture will be distributed uniformly, both as to quality and quantity, to the several cylinders. It is a further object to form the manifold so that it may be used as a replacement construction on engines having` manifolds of different construction.

In. the construction of multi-cylinder engines it is quiteusual to supply the explosive gas to pairs of cylinders through a common port in the engine block and to supply the gas to these ports through a branched manifold. In operation, it frequently happens that the quality of explosive gas delivered to one cylinder is very different than that delivered to another, so

that the engine is ununiform in its operation. To avoid this result I have designed a construction of manifold in which there is; iirst, mixing means in advance of the branch in said manifold for insuring a uniform quality of the gas passing into the branch conduits; second, a symmetrical arrangement of said branches with respect to the supply portion of the manifold; third, mixing means in advance of the port openings in the cylinder block for insuring uniform quality of mixture to the engine cylinders connected thereto; and fourth, a

symmetrical arrangement of the portion of the manifold for supplying gas to said ports, in the engine block. The result is that the mixture `is uniform in both quantity and quality in its distribution to the several cylinders.

In the drawings I have shown a specific construction of manifold partly designed for use in connection with the engine on a Ford motor car, but also applicable to other constructions.

Figure l is a sectional front elevation;

Figure 2 is a sectional plan view; and

Figure 3 is a transverse section showing portion in the central plane of the manifold'and a portion in the plane of the port opening into the engine block.

A is the engine block having formed therein the port openings B, which are ar ranged symmetrically with respect to branch passages C and C leading to pairs of cylinders.A D is my improved construction of manifold which, if desired, may be used to replace the construction first installed on the engine. This manifold has a portion E for connecting with the carburetor and Which extends upward in the central transverse plane of the engine block and at its upper end connects with aligned horizontally extending branches F and F. lust in advance of the point of juncture with these branches is a restriction in the portion E, preferably in the form of a venturi, as indicated' at G, the effect of which is to both increasethe velocity and to cause a thorough commingling of the constituent portions of the gases. The branches F and F are provided with bends H, which con- `nect the same with portions I and I extending perpendicular to the engine block and having therein restrictions, also preferably in the venturi form, as indicated at J. These will cause a further commingling of the gases, so that uniform quality is produced for distribution between the branches C and C.

With the construction described the explosive mixture, which is proportioned by the carburetor, passes through the manifold to the branches F and F thereof, but before entering` the branches the stream is symmeu trized by passing through the venturi restriction G. This will insure that the quality of mixture passing through said branches will be uniform. The stream passing through each branch will again be symmetrized bef-ore entering the engine block and will then be symmetrically sub-divided between the cylinders. The final result is that each of the cylinders will receive a charge equal to that of every other cylinder, that the engine will operate smoothly and a plurality of cylinders having inlet ports connectin r with and s mm ,icaIl arra Aed y y ng,

with respect to each of sa branches, and venturi1 restrictions inA said branches. immediately in `advance of, the, cgmnectiops to said cylinders for effecting a thorough comlilinglmg of thegases by thesubsequent neexpansion before.` and during entrance to the` c linders.,

2. he` combination withy a multi-cylinder internal combustion engine provided with more than two cylinders, of, a manifold therefor comprising a main portion for` re,- ceivng the explosive mixture a Pair of branches arranged symmetrically in respect to saidmain portion, said branches, terminatlng ixifportwns extendlng perpendicular to therengine block, a venturirestriction 1n the mainporton of, said manifpldadjacent therewith, and

to the bwwhes connect venturi restrictions in, tUg branches,perpendicular to i said engine block at an, intervalk from the .entrwce to the blockfor, the purpose as stated.

3. The combination with an engineblock havingi a plurality of pairs of cylinders, eachpar havingja common inlet port in said e portions ot said` block, of a manifold comprising a main portionta pair of branches arranged symmetrically Withrespect to said main portion, each of said branches terminating in a portion extending perpendicular to said engine block and @meting-with the common port for a pair of cylinders, and venturi restrictions in said manifold. onev being located in said main, portion close adjacent to said branches, andthe others in said branch por tions close adjacent to said ports.

L1`. ',I`l'1e combination with a mu1ti-cylinder i termal coinb,y tion engine having more tllmn two cylin, ers, of a m -fold provided with synnnetrically arrange?? branches, venturi restrictions innnediately in advance of said liranclsforsymmetrizin the stream to be. divided therebetween, an venturi restlitiqrl l1n each branch, for again symmetrizing t e stream immediately in advance of the subiflvision of the same between the respective cylinders, y

5., The combination with a multi-cylinder internal combustion engine, of a manifold there or comprising a niainportion for receiving the explosive mixture from the carburetor, branches. symmetrically arranged wit respect lto said lmain portionventuri restrictions immediately in advance of said branches for symmetrizin i the stream of mixture passim v through t e main portion, means for :t'urt` er s mmetrically sub-,dividing each branch, an `venturi restrictions immediately in, advance of the la'slt mentioned suh-,dividisons for similarly symmetrizing the stream,

JIn testimony-whereof I affix my Signature.

ALANSON. P. BRUSH. 

